Telephone-transmitter



(No Model.) I

J. W. BONTA.

TELEPHONE TRANSMITTER. No. 352.176. Patented Nov. 9, 1886-.

WlT/VfiSSES. INVENTOR L4 TTORNEY UNITED. STATES PATENT OFFICE.

JAMES W. BONTA, OF PHILADELPHIA, PENNSYLVANIA.

TELEP HONE-TRANSM ITTER.

SPECIFICATION forming part of Letters Patent N 0. 352,176, datedNovember 9, 1886.

Application filed March 11, 1886. Serial No. 194,801. (No model.)

To all whom it may concern:

Be it known that I, JAMES W. BONTA, a

' citizen of the United States, residing at Philaphonic'transmitterembodying my improvements. Fig. 2 is a rear view ofa portion of' thesame.

My invention has relation to that form of telephonic transmitter whereinan electrode is affixed to the diaphragm, and a loose or movableelectrode-preferably a ball-is supported upon an inclined table. whichis adjustable as to its inclination for varying or regulating theinitial contactpressure be tween the electrodes, a form of which isshown in United States Letters Patent granted to me January 5, 1886, andnumbered 333,816.

In this patent the inclined table is shown pivoted to the transmitterbox or casing and adjusted as to its iuclinationby a screw. I

My present invention has for its object simplicity of construction andarrangement of parts, as hereinafter described and claimed, wherebyeconomyin the first cost of the instrument is obtained and the-initialcontactpressure between the electrodes is varied without altering theinclination of the table or platform supporting the movable electrode.

A represents a transmitter box or'casing having a removable front, a,provided with a suitable mouthpiece, a; B, the diaphragm, and Gtheelectrode fixed thereon, which is preferably a piece of carbon.Through the box A, when composed of a block of wood, as'shown, is acentral square or rectangular aperture, a for the reception of a tableor platform, D, for the loose or movable electrode E. The latter ispreferably a ball or sphere of carbon, and rests in a groove, d, formedin the platform or table D, which is preferably a carbon block, and issupported upon a wedge, F, which rests upon the bottom of the aperturea, as indicated. I

By pushing, sliding, or moving the wedge F to and from the diaphragm theplatform or tableD is elevated or depressed to place more or less of themass or Weight of the ball or movable electrode either above or belowthe axial, line of the diaphragm electrode, and thereby vary the initialcontact-pressure between the electrodes without disturbing theinclination of the table D.

Any suitable inductorium, G, may be employed in connection with thetransmitter, the

primary, 1, ofwhich includes within its circuit the diaphragm-electrode,the ball,thetable, and the battery H, as shown, and the secondary, 2

7 connects with or forms part of the line.

The aperture a in box A is preferably of a width just sufficient toloosely receive tableD and the wedge F so that the latter can slide ormove easily in the same, as more plainly shown in Fig. 2.

I desire to secure by this application the broad idea of adjusting atable vertically with out altering the inclination. Separateapplications, Nos. 194,802, 194,803, and 194,804,

filed on even date with this, cover specific means and modifications.not herein claimed.

YVhat I claim is- 1. In a telephonic transmitter, the combi nation of adiaphragm, an electrode affixed thereto, an inclined table, a loose ballor electrode resting on said table and in contact with thediaphragm-electrode, and means for elevating and lowering thetablewithou't altering its inclination, substantially as shown anddescribed.

2. The combination, in atelephonic transmitter, of a fixeddiaphragm-electrode, an inclined table, a loose ormovable electrode uponsaid table, and an adjusting-wedge, substantially as shown anddescribed.

3. The combination, in a telephonic transmitter, of a fixed diaphragmelectrode, 0, ball or loose electrode E, p1ate or table D, and wedge F,substantially as shown and described.

' 4. A telephonic transmitter having fixed diaphragm-electrode (J, ballE, carbon-table D, having groove (1, and wedge F, substantially as setforth.

5. In a telephonic transmitter, the combina I Witnesses:

S. J. VAN STAVOREN, OnAs. F. VAN How.

